Lucius c



(No Model.)

L. G. .WEST 8v N. CHASE. SPRING TOOTH HARROW.

No. 244,100. Patented July 12,1881..

Fzf A t 1113.6 al y M mm* @um u mi. rl N UNITED STATES PATENT OFFICE.

LUCIUS O. WEST AND NEHEMIAH CHASE, OF KALAMAZOO, MICHIGAN, ASSIGNORS TO CHASE, TAYLOR & CO., OF SAME PLACE.

sPRiNG-TOOTH 'HAaRow SPECIFICATION forming part of Letters Patent No. 244,100, dated July 12, 1881.

Application lcd May 16,1881. (No model.)

To all whom fit may concern:

Be it known that we, LUCIUS O. VEsT and NEHEMIAH CHASE, citizens of the United States, residing at Kalamazoo, county of Kalamazoo, State of Michigan, have jointly invented a new and useful Spring-Tooth Harrow, of which the following is a speciication.

Our invention relates to that class of springteeth which, from their working-point to their shank, which connects with the beam, are formed in a continuous curve, uninterrupted. and unbroken both as regards the curve and the metal of which the teeth are composed, and the entire sp1-in g of which is expansive.

It also relates to devices for securing the shank of spring harrow-teeth to the tooth-beam, in the use of which the shank is located in a recess or mortise immediately in the timber.

Our invention has for its object such a coustruction of aharrow-tooth as will iect a great contraction of the tooth-frame in use with the above-specified cla-ss of teeth, and in which construction less horizontal oscillation or rearward spring of the tooth is also effected, and an increased vertical oscillation imparted to them, and also whereby said class of teeth are made to automatically control their degree of elasticity in relation to the consistency ofthe soil.

A further object is to so construct a device for holding harrow-teeth secure in a recess in the beam that an increased security with less strain on the parts is effected, and the device holding` the tooth is made to line the edges ot' said recess or mortise.

A construction embodying our improvements in the tooth consists in bending` a strip of steel in an uninterrupted curve from its workingpoint a little below the frame to its shank secured on top of the beam in a manner that the bowed body of the tooth, which hangs well in advance of the beam, shall extend over the next forward beam for about half the width of said beam, and that the space bounded by the periphery of said body shall resemble the form of an egg lying over the beams horizontal therewith, with its large end forward.

To economize steel and avoid short angles and curves in the construction of this style of tooth, we iind it necessary to form the shank thereof convexed, as seen in the drawings. By

this construction we are enabled to locate the beams very close together, thus contracting or shortening the length of the frame and lessening the resistance to the draft-power.

rlhe spring of the tooth, owing to the shape and position of the bowed body, is largely vertical, which admits of contracting the frame used with this style of tooth, besides effecting desired results in the soil; and, further, the tooth is automatically adjustable in regard to its elasticity, explained in the operation.

We construct the holder of two bindingplates having pendent dan ges from the center of their under face, said lian ges being recessed or broken in the center to admit of the securin g-bolt being passed directly through the center of the plate, that the bearing of each side flange shall he equal on the beam and tooth. rlhe mortise in the beam is so made that the side iange of the binding-plate, which rests on the beam,'shall be sunk a little below the surface of said beam. By this construction the usual wear on the sides of the mortise is obviated, and the bearing ot' the holder on the tooth will be equal as contrasted with a casting ex- 7 5 tending entirely over the shank.

In the drawings forming a part of this specitication, in which similar letters of reference indicate like parts, Figurel is a side view ofthe tooth and an end view of the beams; Fig. 2, top perspective of beam and binding-plates; Fig. 3, longitudinal section of the beam and a broken cross-section of the tooth and a binding-plate 5 Fig. 4, top perspective ot' the bindin g-plate; Fig. 5, cross-section of the beam and a longitudinal section of the binding-plate, showing side of the pendent flange; and Fig. 6, top broken view of beams and teeth.

Bis the tooth-beam, with convex mortise in top face, in which the shank of toothA C is 1ocated. Shallow mortises or shelves are formed each side of said shank-mortise to receive the side flanges of the binding-plates a a.

In Figs. 2 and 3 the pendent flange c is shown lining the edges or sides of the shankmortise. In Fig. 5 the recess or broken center of flange e is shown with bolt 'v located therein and binding the plate a to the tooth-shank and beam, Fig. 2.

In the. operation, referring to Fig.1, d shows roo a space between the bowed egg-shaped body of tooth C and beam B, vas in the general use of the tooth in average soil 5 but when the teeth intercept a hard strip of soil this portion of the body rests on the beam, as at y, which temporarily deprives the tooth of a large degree of elasticity. This portion of the gure also shows the vertical and slight rearward bend or spring of the tooth.

The further operation of the tooth and also of the holder is deemed to be suciently explained.

What We claim as new, and desire to secure by Letters Patent, is-

l. The tooth having` the forward portion of the bowed body extending partially over and a little above the next adjacent beam, and adapted to automatically engage it, as set forth, in controlling` the elasticity of Said tooth.

2. The barrow-tooth having the egg-shaped 2o or bowed portion of the tooth located as specied, and terminating on top of the beam in a convex shank, all substantially as set forth.

3. In a harrow, the tooth-beam having the mortises for the shank and holder described, 2 5 in combination with the toothand the bindingplates having the pendent center flange, with its center recess and the bolts located therein, and securing said plates to the beam, all substantially as set forth.

LUUIUS C. WEST. y NEHEMIAH CHASE.

Witnesses:

J oHN D. SUMNER, G. S. CHURCHILL. 

